US3786039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing alpha-l-aspartyl-l-phenylalanine lower alkyl esters
Assignee: Ajinomoto Co Inc
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Filing: 1970-04-15
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Granted: 1974-01-15
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Expires: 1990-04-15
Abstract
Abstract LOWER ALKYL ESTERS OF A-L-ASPARTYL-L-PHENYLALANINE OF THE FORMULA H2N-CH(-CH2-COOH)-CO-NH-CH(-CH2-C6H5)-COO-R WHEREIN R IS LOWER ALKYL ARE PREPARED BY REACTING AN N-ACYL-L-ASPARTIC ANHYDRIDE WITH A LOWER ALKYL ESTER OF L-PHENYLALANINE IN AN INERT ORGANIC SOLVENT, AND THEN REMOVING THE ACYL GROUP WHICH MAY BE FORMYL, CARBOBENZOXY, OR P-METHOXYCARBODENZOXY.
Inventors
- 👤 Y Ariyoshi
- 👤 M Nagao
- 👤 J Kirimura
- 👤 N Sato
- 👤 A Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:40
CPC Classifications
C; C07; C07K; C07K5/00; C07K5/04; C07K5/06; C07K5/06104; C07K5/06113; C07K5/06121; C07K5/0613; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/55; Y10; Y10S; Y10S530/00; Y10S530/801
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |